Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, about a three-phase distribution board and old colour markings, is answered by SELECT:
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| A three-phase DB - what supply colours? |
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Question: I've recently come across an installation that has a two-phase mains supply which feeds a three-phase distribution board, marked with the old colours R,Y,B.
If I re-mark this distribution board to reflect the actual phases R,Y,R (or L1,L2,L1 with the new system), would a two-phase supply be acceptable - or should I request a three-phase supply from the supply company?
Answer: It is acceptable to use a two-phase supply, but the conductors should be marked, as you are suggesting, to clearly identify them.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: www.voltimum.co.uk/consult.php?universe=consult.index.questions
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